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Date: Fri, 31 Jul 2015 10:41:07 +0100 From: David Vrabel <david.vrabel@...rix.com> To: Andy Lutomirski <luto@...nel.org>, X86 ML <x86@...nel.org>, "Borislav Petkov" <bp@...en8.de>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> CC: "security@...nel.org" <security@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Andrew Cooper <andrew.cooper3@...rix.com>, "Steven Rostedt" <rostedt@...dmis.org>, xen-devel <xen-devel@...ts.xen.org>, <stable@...r.kernel.org>, Jan Beulich <jbeulich@...e.com>, Sasha Levin <sasha.levin@...cle.com>, Boris Ostrovsky <boris.ostrovsky@...cle.com> Subject: Re: [Xen-devel] [PATCH v6 1/4] x86/xen: Probe target addresses in set_aliased_prot before the hypercall On 30/07/15 22:31, Andy Lutomirski wrote: > The update_va_mapping hypercall can fail if the VA isn't present in > the guest's page tables. Under certain loads, this can result in an > OOPS when the target address is in unpopulated vmap space. > > While we're at it, add comments to help explain what's going on. > > This isn't a great long-term fix. This code should probably be > changed to use something like set_memory_ro. Reviewed-by: David Vrabel <david.vrabel@...rix.com> Thanks. David -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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